Reduxify: Notices

[tyxla]

This EventEmitter store is used quite a bit in Calypso (48 occurrences at this time) for managing global notices (source).

We already have a working (and quite well adopted) Redux implementation, so to get away from the EventEmitter implementation, we have to port every usage to use Redux. Those refactors are usually trivial, but it'll take some time to carry them all out.

[tyxla]

I'm going to start working on this one.

[tyxla]

The first two PRs, #48670 and #48671, reduxifying notices in SiteTools and password settings.

[tyxla]

#48672 reduxifies the notice in EditContactInfoFormCard.

[tyxla]

#48689 reduxifies notices in SEO settings.

[tyxla]

A few more PRs here:

• Checkout: Reduxify notices in composite checkout #48912 to reduxify notices in composite checkout.
• WordAds: Remove unused notices #48915 to remove unused notices in WordAds earnings page
• Marketing: Reduxify notices #48918 to reduxify notices for the Marketing section.

[tyxla]

#49001 and #49003 to reduxify notices MultipleChoiceQuestion and PaymentMethodForm.

[tyxla]

Several more reduxification or cleanup PRs today:

• Purchases: Reduxify domain cancelation notices #49295 - Purchases - Reduxify domain cancelation notices
• Shopping Cart: Reduxify notices in CartMessages #49297 - Shopping Cart: Reduxify notices in CartMessages
• Purchases: Reduxify notices in ChangePaymentMethod #49298 - Purchases: Reduxify notices in ChangePaymentMethod
• Purchases: Reduxify survey notice #49302 - Purchases: Reduxify survey notice
• Help: Reduxify notices in HelpUnverifiedWarning #49303 - Help: Reduxify notices in HelpUnverifiedWarning
• Customizer: Remove unused notices #49308 - Customizer: Remove unused notices

[tyxla]

Several more PRs today to reduxify the last bits:

#49530 - Purchases: Reduxify notices in RemovePurchase
#49533 - Purchases: Reduxify notices in GSuiteCancelPurchaseDialog
#49541 - Purchases: Reduxify notices in payment method forms
#49542 - Help: Reduxify notices in HelpContact

Furthermore, #49461 takes a stab at typing the notices actions, and #49544 deprecates the old notices library.

[tyxla]

#49600 has been open to reduxify notices in the formBase mixin, last-minute before it's actually gone. This is actually the last instance that dispatches notices the old way; once we merge all open PRs we can remove the legacy infrastructure altogether.

[tyxla]

Final PR to remove the legacy notices store once all the above PRs are merged: #49663 🎉

[tyxla]

All PRs have been merged, only the last one for final removal remains: #49663